干旱区生态环境知识资源中心(Arid): Divergent Response of the Supply Capacity and Turnover of Inorganic Nitrogen to Pitaya Cultivation in the Subtropical Karst Region of Southwest China

Arid

DOI	10.3390/land11060781
	Divergent Response of the Supply Capacity and Turnover of Inorganic Nitrogen to Pitaya Cultivation in the Subtropical Karst Region of Southwest China
	Yang, Lin; Zhang, Xuebin; Liu, Jinxia; Wen, Dongni; Meng, Lei; Zhu, Tongbin
通讯作者	Meng, L
来源期刊	LAND
EISSN	2073-445X
出版年	2022
卷号	11 期号:6
英文摘要	Determining the availability and supply capacity of soil inorganic nitrogen (N) can effectively guide the appropriate application of N fertilizers during crop cultivation. However, the mechanism underlying soil inorganic N production remains unknown for cash crops in karst regions. In this study, the rates of organic N mineralization to ammonium (NH4+) and NH4+ nitrification to nitrate (NO3-) were determined using a N-15 tracing technique to evaluate the supply capacity of inorganic N in soils from woodland and pitaya plantations with different cultivation years (3, 9, and 15 years) in the subtropical karst region of China. The conversion of woodland to pitaya plantations significantly decreased the content of soil organic carbon (SOC), total N, calcium (Ca), and magnesium (Mg), along with the soil pH and cation-exchange capacity (CEC), but significantly increased the content of available potassium, available phosphorus, iron, and aluminum, in a more pronounced fashion with the increasing length of pitaya cultivation. The conversion of woodland to pitaya plantations has not significantly changed soil NH4+ and NO3- content, but this land use has resulted in divergent effects on mineralization and nitrification rates. Compared to woodland (5.49 mg N kg(-1) d(-1)), pitaya cultivation significantly reduced the mineralization rate to 0.62-2.38 mg N kg(-1) d(-1). Conversely, the nitrification rate significantly increased from 4.71 mg N kg(-1) d(-1) in soil under woodland to 9.32 mg N kg(-1) d(-1) in soil under 3-year pitaya cultivation, but this rate decreased to 1.74 mg N kg(-1) d(-1) under 15-year cultivation. Furthermore, the mean residence time of inorganic N was significantly higher in long-term than in short-term pitaya plantations, indicating the decline in inorganic N turnover with the increasing length of pitaya cultivation. Taken together, long-term pitaya cultivation could significantly decrease the supply capacity and turnover of inorganic N in soil. The Ca, Mg, SOC, and total N content, as well as CEC, were significantly and positively related to the mineralization rate, but negatively related to the mean residence time of NH4+ and NO3-, suggesting that the incorporation of organic matter can accelerate the soil inorganic N supply and turnover for long-term pitaya plantation in subtropical regions.
英文关键词	pitaya cultivation N-15 tracing mineralization rate nitrification rate mean residence time of inorganic N
类型	Article
语种	英语
开放获取类型	gold
收录类别	SSCI
WOS记录号	WOS:000816061900001
WOS关键词	ROCKY DESERTIFICATION ; ORGANIC-MATTER ; LAND-USE ; SOILS ; TRANSFORMATIONS ; IMPACT ; CARBON ; NITRIFICATION ; FORESTS ; QUALITY
WOS类目	Environmental Studies
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/393674
推荐引用方式 GB/T 7714	Yang, Lin,Zhang, Xuebin,Liu, Jinxia,et al. Divergent Response of the Supply Capacity and Turnover of Inorganic Nitrogen to Pitaya Cultivation in the Subtropical Karst Region of Southwest China[J],2022,11(6).
APA	Yang, Lin,Zhang, Xuebin,Liu, Jinxia,Wen, Dongni,Meng, Lei,&Zhu, Tongbin.(2022).Divergent Response of the Supply Capacity and Turnover of Inorganic Nitrogen to Pitaya Cultivation in the Subtropical Karst Region of Southwest China.LAND,11(6).
MLA	Yang, Lin,et al."Divergent Response of the Supply Capacity and Turnover of Inorganic Nitrogen to Pitaya Cultivation in the Subtropical Karst Region of Southwest China".LAND 11.6(2022).